From 0a924af89435e628ddecdfc658fa088a6acfb8f6 Mon Sep 17 00:00:00 2001
From: John Safranek <john@wolfssl.com>
Date: Fri, 22 Nov 2019 10:01:21 -0800
Subject: [PATCH] Maintenance: Prime 1. Prime test should return NO for 1. (sp
 math)

---
 wolfcrypt/src/sp_int.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/wolfcrypt/src/sp_int.c b/wolfcrypt/src/sp_int.c
index 9e9b99530..422614e3d 100644
--- a/wolfcrypt/src/sp_int.c
+++ b/wolfcrypt/src/sp_int.c
@@ -1703,6 +1703,11 @@ int sp_prime_is_prime(sp_int *a, int t, int* result)
         err = MP_VAL;
     }
 
+    if (sp_isone(a)) {
+        *result = MP_NO;
+        return MP_OKAY;
+    }
+
     if (err == MP_OKAY && a->used == 1) {
         /* check against primes table */
         for (i = 0; i < SP_PRIME_SIZE; i++) {
@@ -1783,6 +1788,11 @@ int sp_prime_is_prime_ex(sp_int* a, int t, int* result, WC_RNG* rng)
     if (a == NULL || result == NULL || rng == NULL)
         err = MP_VAL;
 
+    if (sp_isone(a)) {
+        *result = MP_NO;
+        return MP_OKAY;
+    }
+
     if (err == MP_OKAY && a->used == 1) {
         /* check against primes table */
         for (i = 0; i < SP_PRIME_SIZE; i++) {